CN103137654B - Electroluminescent display panel - Google Patents

Abstract

The invention provides an electroluminescent display panel, which includes a substrate, an electroluminescent display array, at least a first packaging film layer and a first patterned stress release layer. The electroluminescent display array is disposed on the substrate, the first packaging film layer covers the electroluminescent display array, and the first patterned stress release layer covers the first packaging film layer.

Description

Electroluminescence display panel

technical field

The invention relates to an electroluminescence display panel, in particular to an electroluminescence display panel with a patterned stress release layer.

Background technique

The electroluminescent display panel is a display panel that uses electroluminescent elements such as organic light emitting diode elements as display elements. Since the electroluminescent element is sensitive to water vapor and oxygen, it is necessary to protect the electroluminescent element with a packaging film layer that has the effect of blocking water and oxygen. In addition, in order to further block moisture and oxygen, glue is used to combine the substrate with the electroluminescence element and the glass cover. However, the glass cover will increase the overall thickness of the electroluminescent display panel, and the glass cover is a rigid substrate, so it cannot be used on the flexible electroluminescent display panel.

In the case where the glass cover cannot be used, the flexible electroluminescent display panel generally uses a multi-layer stacked packaging film layer of different materials to increase the water and oxygen blocking effect. Multi-layer stack packaging film layer. However, the stress of the inorganic packaging film layer is relatively large, which is prone to crack or peeling problems. In addition, the organic encapsulation film layer and the inorganic encapsulation film layer of the multi-layer stacked encapsulation film layer have different refractive indices, which is prone to optical interference, resulting in poor display quality of the electroluminescence display panel.

Contents of the invention

One of the objectives of the present invention is to provide an electroluminescent display panel to overcome the problems of cracking, peeling and optical interference faced by the existing electroluminescent display panel using thin film packaging.

An embodiment of the present invention provides an electroluminescence display panel, including a substrate, an electroluminescence display array, at least one first packaging film layer, and a first patterned stress release layer. The electroluminescence display array is arranged on the substrate, the first encapsulation film layer covers the electroluminescence display array, and the first patterned stress release layer covers the first encapsulation film layer.

Description of drawings

FIG. 1 shows a schematic top view of an electroluminescence display panel according to a first embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of the electroluminescence display panel shown in Fig. 1 along the section line A-A';

FIG. 3 shows a schematic diagram of an electroluminescent display panel according to a second embodiment of the present invention;

FIG. 4 shows a schematic top view of an electroluminescence display panel according to a third embodiment of the present invention;

Fig. 5 is a schematic cross-sectional view of the electroluminescence display panel shown in Fig. 4 along the section line B-B';

Fig. 6 is a schematic cross-sectional view of the electroluminescence display panel shown in Fig. 4 along the section line C-C';

FIG. 7 shows a schematic top view of an electroluminescence display panel according to a fourth embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of the electroluminescent display panel shown in FIG. 7 along the section line C-C'.

reference sign

1: Electroluminescence display panel 10: Substrate

12: Electroluminescence display array 14: The first packaging film layer

16: first patterned stress release layer 12A: upper surface

12S: side wall 14A: upper surface

14S: side 16A: first closed opening

18: Second packaging film layer 20: Second patterned stress release layer

161: first strip structure 161A: first opening

201: second strip structure 201A: second opening

D1: first direction D2: second direction

3: Electroluminescence display panel 4: Electroluminescence display panel

6: Electroluminescence display panel

detailed description

In order to enable those who are familiar with the technical field of the present invention to have a better understanding of the present invention, the preferred embodiments of the present invention are listed below, together with the accompanying drawings, to describe in detail the composition and effects of the present invention.

Please refer to Figure 1 and Figure 2. Fig. 1 shows a schematic top view of an electroluminescent display panel according to a first embodiment of the present invention, and Fig. 2 is a schematic cross-sectional view of the electroluminescent display panel in Fig. 1 along the section line A-A'. As shown in FIGS. 1 and 2 , the electroluminescence display panel 1 of this embodiment includes a substrate 10 , an electroluminescence display array 12 , at least one first packaging film layer 14 , and a first patterned stress release layer 16 . In this embodiment, the substrate 10 is a flexible substrate such as a plastic substrate, but not limited thereto. In other variant embodiments, the substrate 10 may be a rigid substrate such as a glass substrate. The electroluminescent display array 12 is disposed on the substrate 10 . The electroluminescent display array 12 includes a plurality of electroluminescent elements arranged in an array, such as organic light emitting diode elements, and the electroluminescent elements may include electroluminescent elements for displaying different color pictures, such as red electroluminescent elements, Green electroluminescence element and blue electroluminescence element, but not limited thereto. The electroluminescent elements are respectively arranged in the corresponding sub-pixel regions, and the sub-pixel regions can further be provided with elements such as gate lines, data lines, power lines, active switching elements, driving elements, and storage capacitors, and their configuration and functions are as follows: Those with common knowledge in this field are familiar with it and will not repeat it here.

The first packaging film layer 14 covers the upper surface 12A of the electroluminescent display array 12, and can further cover the sidewall 12S of the electroluminescent display array 12, so as to protect the electroluminescent display array 12 and block moisture and oxygen. In order to avoid damage to the electroluminescent element. The first packaging film layer 14 can be a single-layer packaging film layer or a multi-layer packaging film layer. For example, the first encapsulation film layer 14 may include an organic encapsulation film layer, an inorganic encapsulation film layer or an organic/inorganic hybrid encapsulation film layer, or a multilayer stack structure of the above encapsulation film layers. The material of the organic encapsulation film layer may be, for example, acrylic or epoxy resin; the material of the inorganic encapsulation film layer may be, for example, silicon oxide, silicon nitride or silicon oxynitride. Generally speaking, the water and oxygen blocking effect of the inorganic packaging film layer is better than that of the organic packaging film layer, but the stress of the inorganic packaging film layer is proportional to its thickness, and excessive stress will cause the inorganic packaging film layer to break. Therefore, in terms of material selection, the specifications of the visible water and oxygen blocking effect and the thickness of the first packaging film layer 14 are selected from an organic packaging film layer, an inorganic packaging film layer or an organic/inorganic hybrid packaging film layer.

The first patterned stress release layer 16 covers the upper surface 14A of the first packaging film layer 14 and may further cover the side edge 14S of the first packaging film layer 14 . In this embodiment, the first patterned stress release layer 16 includes a network stress release layer, and the first patterned stress release layer 16 has a plurality of first closed openings 16A, partially exposing the first packaging film layer 14 The upper surface 14A. The first patterned stress release layer 16 has at least the following three functions. First, the first patterned stress release layer 16 has a stress release function, which can prevent the first packaging film layer 14 from being cracked or peeled off due to excessive stress; second, the first patterned stress release layer 16 can destroy the electroluminescence The optical interference generated when the light emitted by the display array 12 passes through the multi-layer packaging film layers with different refractive indices, so as to improve the display quality of the electroluminescent display panel 1; thirdly, the first patterned stress release layer 16 can increase the light extraction efficiency. In this embodiment, the first closed opening 16A is a rectangular opening, but its shape is not limited thereto and can be any other regular shape such as a polygon or a circle, or an irregular shape. In addition, the first closed openings 16A of the first patterned stress release layer 16 may be arranged periodically or in an array, but not limited thereto. In a variant embodiment, the first closed openings 16A of the first patterned stress release layer 16 may be arranged non-periodically. The material of the first patterned stress release layer 16 can be an inorganic material or an organic material. The organic material may include, for example, acryl (Acryl)-based polymer, parylene (Parylene) or polyurea (polyurea), etc., but is not limited thereto. The first patterned stress release layer 16 can be formed by vacuum coating process, printing process such as inkjet process or screen printing process, transfer process such as thermal transfer process, or other suitable process. The material and thickness of the first patterned stress release layer 16 and the shape, size, and arrangement of the first closed openings 16A can be selected and adjusted in consideration of the above three functions.

The electroluminescence display panel of the present invention is not limited to the above-mentioned embodiments. The electroluminescent display panels of other embodiments of the present invention will be introduced in sequence below, and in order to facilitate comparison of differences between the embodiments and simplify description, the same symbols are used to mark the same elements in the following embodiments, and The description will mainly focus on the differences between the embodiments, and the repetitive parts will not be repeated.

Please refer to Figure 3. FIG. 3 shows a schematic diagram of an electroluminescence display panel according to a second embodiment of the present invention. As shown in FIG. 3 , different from the first embodiment, the electroluminescence display panel 3 of this embodiment further includes at least one second packaging film layer 18 . The second encapsulation film layer 18 covers the first patterned stress release layer 16 , and can further cover the sidewall of the first patterned stress release layer 16 , thereby increasing the water and oxygen blocking effect. The second packaging film layer 18 can be a single-layer packaging film layer or a multi-layer packaging film layer. For example, the second encapsulation film layer 18 may include an organic encapsulation film layer, an inorganic encapsulation film layer or an organic/inorganic hybrid encapsulation film layer, or a multilayer stack structure of the above encapsulation film layers. The material of the organic encapsulation film layer may be, for example, acrylic or epoxy resin; the material of the inorganic encapsulation film layer may be, for example, silicon oxide, silicon nitride or silicon oxynitride; an organic/inorganic hybrid encapsulation film layer. The water and oxygen blocking effect of the inorganic packaging film layer is better than that of the organic packaging film layer, but the stress of the inorganic packaging film layer is proportional to its thickness, and excessive stress will cause the inorganic packaging film layer to break. Therefore, in terms of material selection, the specifications of the visible water and oxygen blocking effect and the thickness of the second packaging film layer 18 are selected from an organic packaging film layer, an inorganic packaging film layer or an organic/inorganic hybrid packaging film layer.

Please refer to Figure 4 to Figure 6. Fig. 4 shows a schematic top view of the electroluminescence display panel according to the third embodiment of the present invention, Fig. 5 is a schematic cross-sectional view of the electroluminescence display panel in Fig. 4 along the section line BB', and Fig. 6 is The schematic cross-sectional view of the electroluminescent display panel shown in FIG. 4 along the section line CC'. As shown in FIGS. 4 to 6 , different from the second embodiment, the electroluminescent display panel 4 of this embodiment further includes a second patterned stress release layer 20 . The second patterned stress release layer 20 covers the second packaging film layer 18 . The second patterned stress release layer 20 also has the effects of stress release, destroying optical interference and increasing light efficiency, and the second patterned stress release layer 20 can also use inorganic materials or organic materials, wherein its material can be compared with the first The materials of the patterned stress release layer 16 are the same or different. In this embodiment, the first patterned stress release layer 16 includes a plurality of first strip structures 161 arranged along the first direction D1, and first openings 161A are formed between adjacent first strip structures 161 (as shown in FIG. 5), the first packaging film layer 14 is partially exposed. The second patterned stress release layer 20 includes a plurality of second strip structures 201 arranged along the second direction D2, and a second opening 201A (as shown in FIG. 6 ) is formed between adjacent second strip structures 201, partly The second packaging film layer 18 is exposed. In this embodiment, the electroluminescence display panel 4 includes two layers of encapsulation film and two layers of patterned stress release layer, so it has good water and oxygen blocking effect and stress release effect, reduces optical interference and increases light output. In this embodiment, the first direction D1 and the second direction D2 are substantially perpendicular, and the first strip structures 161 and the second strip structures 201 cross each other and partially overlap.

Please refer to Figure 7 and Figure 8. Fig. 7 shows a schematic top view of an electroluminescent display panel according to a fourth embodiment of the present invention, and Fig. 8 is a schematic cross-sectional view of the electroluminescent display panel in Fig. 7 along the section line C-C'. As shown in FIG. 7 and FIG. 8 , different from the third embodiment, in the electroluminescence display panel 6 in this embodiment, the first direction D1 and the second direction D2 are substantially parallel. In addition, in the vertical projection direction, the first strip structures 161 and the second strip structures 201 are alternately arranged, and the first strip structures 161 generally correspond to the second openings 201A, while the second strip structures 201 generally correspond to Corresponds to the first opening 161A. That is to say, the pattern of the first patterned stress release layer 16 and the pattern of the second patterned stress release layer 20 are complementary, and the two do not overlap in the vertical projection direction. In this embodiment, the electroluminescent display panel 6 also includes two layers of encapsulation film and two layers of patterned stress release layer, so it has good water and oxygen blocking effect and stress release effect, reduces optical interference and increases light output.

To sum up, the electroluminescence display panel of the present invention is provided with a patterned stress release layer, which not only can effectively avoid cracking and peeling of the encapsulation film layer, but also reduce optical interference and increase light extraction efficiency, thereby improving display quality and optical performance .

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (11)

1. An electroluminescence display panel, characterized in that, comprising: a substrate; An electroluminescence display array, arranged on the substrate; at least one first packaging film layer covering the electroluminescent display array; and a first patterned stress release layer, covering the at least one first encapsulation film layer, having a predetermined pattern; The at least one first encapsulation film layer also covers the sidewall of the electroluminescent display array, and the first patterned stress release layer also covers the side edge of the at least one first encapsulation film layer. 2. The electroluminescence display panel according to claim 1, wherein the first patterned stress release layer comprises a mesh stress release layer, and the first patterned stress release layer has a plurality of first closed The type opening partially exposes the at least one first encapsulation film layer. 3. The electroluminescence display panel according to claim 2, wherein the first closed openings of the first patterned stress release layer are arranged periodically. 4 . The electroluminescent display panel according to claim 2 , wherein the first closed openings of the first patterned stress release layer are non-periodically arranged. 5 . The electroluminescence display panel according to claim 1 , further comprising at least one second packaging film layer covering the first patterned stress release layer. 6 . The electroluminescence display panel according to claim 5 , wherein the at least one second encapsulation film layer comprises an inorganic encapsulation film layer, an organic encapsulation film layer, and an organic/inorganic hybrid encapsulation film layer. 7 . The electroluminescence display panel according to claim 6 , further comprising a second patterned stress release layer covering the at least one second packaging film layer and having another predetermined pattern. 8. The electroluminescence display panel according to claim 7, wherein the first patterned stress release layer comprises a plurality of first strip structures arranged along a first direction, and any two adjacent ones A first opening is formed between the first strip structures, partially exposing the at least one first encapsulation film layer, the second patterned stress release layer includes a plurality of second strip structures arranged along a second direction, and any A second opening is formed between two adjacent second strip structures, partially exposing the at least one second packaging film layer. 9. The electroluminescence display panel according to claim 8, wherein the first direction is perpendicular to the second direction. 10. The electroluminescence display panel according to claim 8, wherein the first direction is parallel to the second direction, and in a vertical projection direction, the first strip structures and the second strips The strip structures are arranged alternately, and the first strip structures correspond to the second openings, and the second strip structures correspond to the first openings. 11. The electroluminescent display panel according to claim 1, wherein the substrate comprises a flexible substrate.